Iphone 切换选项卡栏时检测选定的选项卡栏

我有三个选项卡栏应用程序，我的选项卡是TAB1、TAB2、TAB3。我在TAB1视图控制器中编写了以下代码，以检测用户按下了哪个选项卡

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item 
{ 
    NSLog(@"tab selected: %@", item.title); 
} 

但这名代表从未接到过电话

我已经在appdelegate.m中设置了我的选项卡

- (void)setupTabBar 
{
    self.myWorkListViewController = [[MyWorkListViewController alloc] initWithNibName:@"MyWorkListViewController"
                                                                               bundle:nil];
    self.askHRViewController = [[AskHRViewController alloc] initWithNibName:@"AskHRViewController"
                                                                     bundle:nil];

    self.moreViewController = [[MoreViewController alloc] initWithNibName:@"MoreViewController"
                                                                           bundle:nil];

    self.bookLeaveViewController = [[BookLeaveViewController alloc] initWithNibName:@"BookLeaveViewController"
                                                                             bundle:nil];
    self.helpViewController = [[HelpViewController alloc] initWithNibName:@"HelpViewController"
                                                                   bundle:nil];

    // Create navigation controllers
    workListNavigationController = [[UINavigationController alloc] initWithRootViewController:self.myWorkListViewController];

    askHRNavigationController = [[UINavigationController alloc] initWithRootViewController:self.askHRViewController];

    bookLeaveViewController = [[UINavigationController alloc] initWithRootViewController:self.bookLeaveViewController];

    moreNavigationController = [[UINavigationController alloc] initWithRootViewController:self.moreViewController];

    helpNavigationController = [[UINavigationController alloc] initWithRootViewController:self.helpViewController];

    [self setTabBarImagesAndText];

    // Setup tab bar controller
    self.tabBarController = [[UITabBarController alloc] init];
    [self.tabBarController setViewControllers:[NSArray arrayWithObjects:workListNavigationController, askHRNavigationController, bookLeaveViewController, helpNavigationController,moreNavigationController, nil]];
    //Set TabBar background
    [self.tabBarController.tabBar insertSubview:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"TabBar_iOS4_Background"]] atIndex:0];
    [self.tabBarController setSelectedIndex:0];

}

---

您可以通过以下方式检测选定的选项卡栏项：- 与你的代码一样，你只需要添加这个行

// Setup tab bar controller
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.delegate=self;
    [self.tabBarController setViewControllers:[NSArray arrayWithObjects:workListNavigationController, askHRNavigationController, bookLeaveViewController, helpNavigationController,moreNavigationController, nil]];
    //Set TabBar background
    [self.tabBarController.tabBar insertSubview:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"TabBar_iOS4_Background"]] atIndex:0];
    [self.tabBarController setSelectedIndex:0];

在.h文件中定义like

@interface yourViewcontroller : UIViewController<UITabBarControllerDelegate>
{
   //declare your Tabbar controller with @proparty 
}

现在把这个UITabbarController的委托

- (void)tabBarController:(UITabBarController *)tabBarController 
 didSelectViewController:(UIViewController *)viewController
{
    NSLog(@"controller class: %@", NSStringFromClass([viewController class]));
    NSLog(@"controller title: %@", viewController.title);

    if (viewController == tabBarController.moreNavigationController)
    {
        tabBarController.moreNavigationController.delegate = self;
    }
}

---

您可以通过以下方式检测选定的选项卡栏项：- 与你的代码一样，你只需要添加这个行

// Setup tab bar controller
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.delegate=self;
    [self.tabBarController setViewControllers:[NSArray arrayWithObjects:workListNavigationController, askHRNavigationController, bookLeaveViewController, helpNavigationController,moreNavigationController, nil]];
    //Set TabBar background
    [self.tabBarController.tabBar insertSubview:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"TabBar_iOS4_Background"]] atIndex:0];
    [self.tabBarController setSelectedIndex:0];

在.h文件中定义like

@interface yourViewcontroller : UIViewController<UITabBarControllerDelegate>
{
   //declare your Tabbar controller with @proparty 
}

现在把这个UITabbarController的委托

- (void)tabBarController:(UITabBarController *)tabBarController 
 didSelectViewController:(UIViewController *)viewController
{
    NSLog(@"controller class: %@", NSStringFromClass([viewController class]));
    NSLog(@"controller title: %@", viewController.title);

    if (viewController == tabBarController.moreNavigationController)
    {
        tabBarController.moreNavigationController.delegate = self;
    }
}

您必须使用代码（在ViewDidLoad等中）或在interface builder中“连接”代理。
看看这个解释如何连接textView委托的答案（基本相同）：

您必须使用代码（在ViewDidLoad等中）或在interface builder中“连接”委托。

---

看看这个答案，它解释了如何连接textView委托（基本相同）：

这个委托方法在TAB1viewcontroller中也没有被调用：（它可以工作，谢谢：）：）但我很惊讶，我必须在每个控制器中设置委托。我们不能一次性进行此设置吗？请参阅此

didSelectViewController

它是

UITabbarController

的委托方法，因此，无论何时需要使用，都必须声明特定UITabbarController的委托，这就是为什么此委托方法也不会被调用的原因在TAB1viewcontroller中：（它可以工作，谢谢：）：）但我很惊讶，我必须在每个控制器中设置委托。我们不能只进行一次设置吗？请参阅此

didSelectViewController

这是

UITabbarController

的委托方法，所以无论何时需要使用，都必须声明特定UITabbarController的委托，这就是原因